mgc

Scalable complete conversion of MgCo2O4 by mechanochemistry for high-performance supercapacitors

Inorg. Chem. Front., 2024, 11,7886-7897
DOI: 10.1039/D4QI02020K, Research Article
Zhiyuan Liu, Qixuan Xiang, Hao Zhang, Xianglong Zhang, Huijun Tan, Yaping Zhao
Complete conversion of MgCo2O4 with excellent electrochemical performance has been successfully achieved.
The content of this RSS Feed (c) The Royal Society of Chemistry




mgc

The crystal structures of Fe-bearing MgCO3 sp2- and sp3-carbonates at 98 GPa from single-crystal X-ray diffraction using synchrotron radiation

The crystal structure of MgCO3-II has long been discussed in the literature where DFT-based model calculations predict a pressure-induced transition of the carbon atom from the sp2 to the sp3 type of bonding. We have now determined the crystal structure of iron-bearing MgCO3-II based on single-crystal X-ray diffraction measurements using synchrotron radiation. We laser-heated a synthetic (Mg0.85Fe0.15)CO3 single crystal at 2500 K and 98 GPa and observed the formation of a monoclinic phase with composition (Mg2.53Fe0.47)C3O9 in the space group C2/m that contains tetra­hedrally coordinated carbon, where CO44− tetra­hedra are linked by corner-sharing oxygen atoms to form three-membered C3O96− ring anions. The crystal structure of (Mg0.85Fe0.15)CO3 (magnesium iron carbonate) at 98 GPa and 300 K is reported here as well. In comparison with previous structure-prediction calculations and powder X-ray diffraction data, our structural data provide reliable information from experiments regarding atomic positions, bond lengths, and bond angles.




mgc

A new monoclinic structure type for ternary gallide MgCoGa2

The crystal structure of MgCoGa2 (magnesium cobalt digallide) was solved by direct methods and refined in two space groups as P21/c (standard choice) and P21/n (non-standard choice). The refined lattice parameters for the standard choice are a = 5.1505 (2), b = 7.2571 (2), c = 8.0264 (3) Å and β = 125.571 (3)°, and for the non-standard choice are a = 5.1505 (2), b = 7.2571 (2), c = 6.5464 (2) Å and β = 94.217 (3)°. All parameters for MgCoGa2 refined to R1 = 0.027 and wR2 = 0.042 using 594 reflections. The crystal structure peculiarities of this compound are discussed. Particular attention has been given to relationships with other similar structures, such as YPd2Si and Fe3C. Crystallographic analysis, together with linear muffin-tin orbital electronic structure calculations, reveals the presence of three-dimensional polyatomic nets with partial covalent bonding between the Ga atoms.




mgc

A new hydrate of magnesium carbonate, MgCO3·6H2O

During investigations of the formation of hydrated magnesium carbonates, a sample of the previously unknown magnesium carbonate hexa­hydrate (MgCO3·6H2O) was synthesized in an aqueous solution at 273.15 K. The crystal structure consists of edge-linked isolated pairs of Mg(CO3)(H2O)4 octa­hedra and noncoordinating water mol­ecules, and exhibits similarities to NiCO3·5.5H2O (hellyerite). The recorded X-ray diffraction pattern and the Raman spectra confirmed the formation of a new phase and its transformation to magnesium carbonate trihydrate (MgCO3·3H2O) at room temperature.




mgc

Crystallization of metastable monoclinic carnallite, KCl·MgCl2·6H2O: missing structural link in the carnallite family

During evaporation of natural and synthetic K–Mg–Cl brines, the formation of almost square plate-like crystals of potassium carnallite (potassium chloride magnesium dichloride hexa­hydrate) was observed. A single-crystal structure analysis revealed a monoclinic cell [a = 9.251 (2), b = 9.516 (2), c = 13.217 (4) Å, β = 90.06 (2)° and space group C2/c]. The structure is isomorphous with other carnallite-type com­pounds, such as NH4Cl·MgCl2·6H2O. Until now, natural and synthetic carnallite, KCl·MgCl2·6H2O, was only known in its ortho­rhom­bic form [a = 16.0780 (3), b = 22.3850 (5), c = 9.5422 (2) Å and space group Pnna].




mgc

MHPS, MHIENG and MGC selected to conduct research on effective recycling of CO<sub>2</sub> to produce methanol<br>-- The collaborative research project commissioned by NEDO aiming at developing carbon capture and utilization (CCU) techno

Mitsubishi Hitachi Power Systems (MHPS), Mitsubishi Heavy Industries Engineering (MHIENG) and Mitsubishi Gas Chemical Company (MGC) were selected by the New Energy and Industrial Technology Development Organization (NEDO) to conduct joint research on the effective recycling of carbon dioxide (CO2) emitted from the refinery at Tomakomai City, Hokkaido Japan where the CO2 is captured and stored by the existing demonstration plant. Further utilizing of the demonstration plant currently employed for CO2 Capture and Storage (CCS), the three companies will collaborate on research activities for CO2 Capture and Utilization (CCU) in order to produce methanol from captured CO2. The research is expected to run until February 2021.




mgc

A first-principles study of the substitutional doping of MgCl2 monolayer for spintronics applications

New J. Chem., 2020, Accepted Manuscript
DOI: 10.1039/D0NJ01264E, Paper
Igo Torres Lima, Railson Vasconcelos, Ricardo Gargano, Edson Nunes Costa Paura
Based on first-principles calculations, we studied the functionalization of MgCl2 monolayer with nonmetal (NM) and transition-metal (TM) atoms. Our results indicate that energetically it is more favorable to create a...
The content of this RSS Feed (c) The Royal Society of Chemistry